Image pickup system and lens apparatus

Abstract

The image pickup system is constituted by a lens apparatus including a focus lens and an image pickup apparatus performing image pickup through the lens apparatus. The system includes an operating part being operated to instruct a movement of the focus lens, a controller performing focus position control to move the focus lens to a position corresponding to an operation amount of the operating part, a ranging part detecting an object distance in each of plural ranging areas included in an image pickup region, and a determining part determining a distance range where the object distances detected in the plural ranging areas are distributed. The system further includes a changing part changing a relationship between the operation amount of the operating part and the position of the focus lens in the focus position control according to a determination result by the determining part.

What is claimed is: 
     
       1. An image pickup system comprising:
 a lens apparatus including a focus lens; 
 an image pickup apparatus configured to perform image pickup through the lens apparatus; 
 an operating part configured to be operated to instruct a movement of the focus lens; 
 a controlling part configured to perform focus position control to move the focus lens to a position corresponding to an operation amount of the operating part; 
 a ranging part configured to detect an object distance in each of plural ranging areas included in an image pickup region; 
 a determining part configured to determine a distance range where the object distances detected in the plural ranging areas are distributed; and 
 a changing part configured to change a relationship between the operation amount of the operating part and the position of the focus lens in the focus position control according to a determination result by the determining part, 
 wherein, when defining the distance range where the detected object distances are distributed as a first distance range, and defining a distance range different from the first distance range as a second distance range, the changing part is configured to change the relationship between the operation amount of the operating part and the position of the focus lens such that a change amount of the position of the focus lens with respect to a change amount of the operation amount of the operating part in a first focus lens movable range corresponding to the first distance range is smaller than that in a second focus lens movable range corresponding to the second distance range. 
 
     
     
       2. An image pickup system according to  claim 1 , wherein the determining part is configured to determine as the distance range an object distance clustering range in which at least part of the detected object distances is clustered. 
     
     
       3. An image pickup system according to  claim 2 , wherein the changing part is configured to change the relationship between the operation amount of the operating part and the position of the focus lens such that a change amount of the position of the focus lens with respect to a change amount of the operation amount of the operating part in the object distance clustering range is smaller than that in an object distance non-clustering range other than the object distance clustering range. 
     
     
       4. An image pickup system according to  claim 1 , wherein the determining part is configured to weight the respective detected object distances and determine the distance range based on the weighted object distances. 
     
     
       5. An image pickup system according to  claim 1 , further comprising:
 a focus detection area setting part configured to set in the image pickup region a focus detection area where a focus state of the lens apparatus is detected, 
 wherein the determining part is configured to determine the distance range where the object distances are distributed detected in the plural ranging areas included in the focus detection area. 
 
     
     
       6. A lens apparatus for an image pickup system including an image pickup apparatus performing image pickup through the lens apparatus, the lens apparatus comprising:
 a focus lens; and 
 a ranging part configured to detect an object distance in each of plural ranging areas included in an image pickup region, 
 wherein the image pickup system comprises: 
 an operating part configured to be operated to instruct a movement of the focus lens; 
 a controlling part configured to perform focus position control to move the focus lens to a position corresponding to an operation amount of the operating part; 
 a determining part configured to determine a distance range where the object distances detected in the plural ranging areas are distributed; and 
 a changing part configured to change a relationship between the operation amount of the operating part and the position of the focus lens in the focus position control according to a determination result by the determining part, 
 wherein, when defining the distance range where the detected object distances are distributed as a first distance range, and defining a distance range different from the first distance range as a second distance range, the changing part is configured to change the relationship between the operation amount of the operating part and the position of the focus lens such that a change amount of the position of the focus lens with respect to a change amount of the operation amount of the operating part in a first focus lens movable range corresponding to the first distance range is smaller than that in a second focus lens movable range corresponding to the second distance range.